didset Questions
4
Solved
I'm testing this and it appears that if you change the value within didSet, you do not get another call to didSet.
var x: Int = 0 {
didSet {
if x == 9 { x = 10 }
}
}
Can I rely on this? Is i...
Loseff asked 2/10, 2016 at 16:24
5
Solved
What is the difference between willSet - didSet, and get - set, when working with this inside a property?
From my point of view, both of them can set a value for a property. When, and why, should ...
Spiro asked 20/8, 2014 at 7:10
9
Solved
Question
Apple's docs specify that:
willSet and didSet observers are not called when a property is first initialized. They are only called when the property’s value is set outside of an initi...
3
Solved
I have a SwiftUI (Beta 5) view with an attached ViewModel. I want to navigate to it via a navigationLink and pass in a simple parameter (called FSAC in this case)
I navigate using
NavigationLink(&q...
5
Solved
If I attempt to run the following code:
photographer = photographer
I get the error:
Assigning a property to itself.
I want to assign the property to itself to force the photographer did...
Poppas asked 10/8, 2015 at 22:31
1
Solved
I have a general problem using toggles with SwiftUI.
Whenever I use them I get this console error:
invalid mode 'kCFRunLoopCommonModes' provided to CFRunLoopRunSpecific - break on _CFRunLoopErr...
0
I would like to observe changes to @Binding property in subview. But there didSet/willSet is not called (it is called only if I change this variable from current view, but if change is from outside...
3
Solved
When I override the function noise, the function gets replaced by the new one. But when I override a property with an observer, the old and new value gets both executed.
In playground:
class Vehi...
Norean asked 7/4, 2015 at 23:54
4
Solved
How can you set a property's value in Swift, without calling its didSet() function outside of an initialization context? The code below was a failed experiment to achieve this within the classes' n...
Pilarpilaster asked 19/8, 2014 at 22:48
3
I'm working on a swift project and I have a couple of arrays. In one of my arrays, I do not want the client to be able to mutate it without using one of my specially-defined methods. On the other h...
11
Solved
Swift has a property declaration syntax very similar to C#'s:
var foo: Int {
get { return getFoo() }
set { setFoo(newValue) }
}
However, it also has willSet and didSet actions. These are calle...
Gospodin asked 3/6, 2014 at 2:32
2
Solved
I rarely see people using [weak self] in didSet. Is there a reason for this?
I tried to use [weak self] in my didSet of a variable:
var data: Dictionary<String, Any>! { // [1]
didSet { [2]...
Benzocaine asked 29/4, 2017 at 8:58
4
Solved
I need the code in didSet to be executed without changing the property's value.
Coming from Objective-C recently, there doesn't seem to be a setMyProperty().
So I tried:
self.myProperty = self.m...
Vasily asked 5/10, 2016 at 7:6
1
Solved
It's well-known that, of course, didSet will not run on the same object again from inside a didSet. (example.)
However. It seems that: the restriction applies not only to that object, but to maybe...
Cognate asked 9/2, 2017 at 18:56
1
Solved
I love this Swift syntax; it's very helpful for many things:
var foo: Bar = Bar() {
willSet {
baz.prepareToDoTheThing()
}
didSet {
baz.doTheThing()
}
}
and I'd love to do this in Kotlin. How...
Iolaiolande asked 4/10, 2016 at 0:2
3
When overriding the didSet observer of a property results in recursion, why?
class TwiceInt {
var value:Int = 0 {
didSet {
value *= 2
}
}
}
class QuadInt : TwiceInt {
override var value:Int...
Blanks asked 21/1, 2015 at 12:57
2
Solved
Swift (from the book 《iOS Animations by Tutorials:Chapter 12》 released by http://www.raywenderlich.com/):
let photoLayer = CALayer()
@IBInspectable
var image: UIImage! {
didSet {
photoLayer.co...
Jephthah asked 24/9, 2015 at 8:5
1
Solved
I have a class as property with a property observer. If I change something in that class, is there a way to trigger didSet as shown in the example:
class Foo {
var items = [1,2,3,4,5]
var number...
Forras asked 5/4, 2015 at 3:14
1
Solved
In my FirstViewController I have a button directing to my SecondViewController, passing data to a property in the SecondViewController. This property has a property observer, creating a new instanc...
1
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